/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.vfs;
import org.crsh.vfs.spi.FSDriver;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
public final class File {
/** . */
private final FS fs;
/** . */
private final Path path;
/** . */
private LinkedList<Handle<?>> handles;
/** . */
private LinkedHashMap<String, File> children;
public File(FS fs, Path path) {
this.fs = fs;
this.path = path;
this.handles = null;
}
public Path getPath() {
return path;
}
public String getName() {
return path.getName();
}
public boolean hasChildren() throws IOException {
return children().iterator().hasNext();
}
public Resource getResource() throws IOException {
for (Handle handle : getHandles()) {
Resource resource = handle.getResource();
if (resource != null) {
return resource;
}
}
return null;
}
public Iterable<Resource> getResources() throws IOException {
List<Resource> urls = Collections.emptyList();
for (Handle<?> handle : getHandles()) {
if (urls.isEmpty()) {
urls = new ArrayList<Resource>();
}
Iterator<Resource> resources = handle.getResources();
while (resources.hasNext()) {
Resource resource = resources.next();
urls.add(resource);
}
}
return urls;
}
public File child(String name) throws IOException {
if (children == null) {
children();
}
return children.get(name);
}
public Iterable<File> children() throws IOException {
if (children == null) {
LinkedHashMap<String, File> children = new LinkedHashMap<String, File>();
for (Handle<?> handle : getHandles()) {
for (Handle<?> childHandle : handle.children()) {
File child = children.get(childHandle.name);
if (child == null) {
child = new File(fs, path.append(childHandle.name, false));
children.put(childHandle.name, child);
}
if (child.handles == null) {
child.handles = new LinkedList<Handle<?>>();
}
child.handles.add(childHandle);
}
}
this.children = children;
}
return children.values();
}
LinkedList<Handle<?>> getHandles() {
if (handles == null) {
LinkedList<Handle<?>> handles = new LinkedList<Handle<?>>();
for (FSDriver<?> driver : fs.drivers) {
Handle<?> handle = null;
try {
handle = getHandle(driver, path);
}
catch (IOException e) {
e.printStackTrace();
}
if (handle != null) {
handles.add(handle);
}
}
this.handles = handles;
}
return handles;
}
<H> Handle<H> getHandle(FSDriver<H> driver, Path path) throws IOException {
H current = resolve(driver, driver.root(), path);
if (current != null) {
return new Handle<H>(driver, current);
} else {
return null;
}
}
private <H> H resolve(FSDriver<H> driver, H current, Path path) throws IOException {
int index = 0;
while (current != null && index < path.getSize()) {
String name = path.nameAt(index++);
current = driver.child(current, name);
}
return current;
}
@Override
public String toString() {
return "File[path=" + path.getValue() + "]";
}
}